首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The library of congress in Washington, D.C. which 【C1】______ the largest collection of books in the world, is fighting a battle
The library of congress in Washington, D.C. which 【C1】______ the largest collection of books in the world, is fighting a battle
admin
2013-01-10
20
问题
The library of congress in Washington, D.C. which 【C1】______ the largest collection of books in the world, is fighting a battle against paper deterioration. The 【C2】______ of the old books, often yellowed and torn, 【C3】______ crumble when they are touched. The main culprit in the battle is the acidic paper tt3at has 【C4】______ making books since the nineteenth century.
Air pollution and moisture 【C5】______ the problem. 【C6】______ the books that are most 【C7】______ destruction are not the oldest books. The paper in books produced 【C8】______ the last century was made 【C9】______ cotton and linen rags, 【C10】______ are naturally low in acid. And the Gutenberg bible, 【C11】______ five centuries ago, was made of thin calfskin, and is in 【C12】______ good shape. But in the nineteenth century, with widespread literacy bringing a demand for a cheaper and more plentiful 【C13】______ of paper, the industry began using 【C14】______ treated wood pulp for making paper. 【C15】______ the chemical in these paper that is causing today’s problem. This problem of paper deterioration is one of 【C16】______ concern. France, Canada, and Austria are all doing research into the new methods of deacidification. A new technology has been 【C17】______ recently, in fact, that allows for mass deacidification of 【C18】______ books at the same time. It costs less than microfilming and 【C19】______ preserves books in their original form. 【C20】______ there will soon be treatment facilities all over the world to preserve and deacidify library book collections.
【C4】
选项
A、been used to
B、used to
C、been used for
D、used for
答案
C
解析
根据上下文,此处应用use被动语态的完成时。因此正确答案是C。
转载请注明原文地址:https://kaotiyun.com/show/zChK777K
0
专业英语四级
相关试题推荐
ManydeathsduringchildbirthcouldbepreventedbythefollowingmethodsEXCEPT
Twoofthechildrenhavetosleepinonebed,buttheotherthreehave______ones.
Sociologistsuse"power"torefertothecapacityofpeopletocontrolorinfluencetheactionsofothers.Sociologistsstudypo
Sheis______enoughwhensheisnotpreoccupiedwithbusinessproblems.
AccordingtonewresearchreleasedthisweekfromMiller-Williams,e-commercecustomersfeelthatover80percentoftheirdecis
IntermsoftheevolutionoflifeonEarth,humanbeingshavejustarrived.【C1】______theirshorttimeonEarth,however,peopl
Thesmallestwordsinourvocabularyoftenrevealthemostaboutus,includinghonestyandthinkingstyle.Stopandthinkabout
WhenSpanishfootballclubBarcelonapaidUS$35millionforRonaldinholastsummer,theyweren’tbuyingaprettyface."Iam【C1】
OnApril8thEnvisat,Europe’slargestEarth-observingsatellite,unexpectedlystoppedtalkingtoitsusersontheEarthbelow.
随机试题
在进行临床实验效果评估中错误的是
矿业权评估中,勘查成本效用法是首先估算已经发生的地质勘查工作的()。
在生态环境现状调查中,社会经济状况调查包括()。
某工程项目业主委托了一监理单位进行监理,在委托监理任务之前,业主与施工单位已经签订施工合同。监理单位在执行合同中陆续遇到一些问题需要进行处理,若你作为监理工程师,对遇到的下列问题,请提出处理意见。问题:1.(1)在施工招标文件中,按工期定
勘察阶段监理工程师对勘察现场作业的质量控制,应重点检查的内容包括( )。
为保证砌块的砌筑质量,每次摊铺水泥砂浆水平缝的长度一般宜()。
()属于劳动监察的原则。
兴华股份有限公司(以下简称兴华公司)为华东地区的一家上市公司,兴华公司2008年至2010年与投资性房地产有关的业务资料如下:(1)2008年1月,兴华公司购入一幢建筑物用于出租,价款为8000000元,款项以银行存款转账支付。不考虑其他相关税费。
接近联想是指认为两种动作或感觉如果以前同时发生,以后也可以同时发生,即可以相互结合。其结果是:若有一个在意识中出现,另一个也成为观念而出现,也就被称为“时近联想”或“邻近联想”。根据以上定义,以下属于接近联想的是:
Lookatthetenstatementsforthispart.Youwillhearatalkabout"ANewChangeofAmericanImmigrationSystem".Dec
最新回复
(
0
)